3/5×2/5÷3/5×2/5
=6/25÷3/5×2/5
=2/5×2/5
=4/25
300-2520÷24
=300-105
=195
3.6÷(7.2-4×1.5)
=3.6÷(7.2-6)
=3.6÷1.2
=3
31÷(1/3+2/5)÷9/11
=31÷(11/15)÷9/11
=31÷(11/15×9/11)
=31÷(3/5)
=155/3
请给满意答案
3/5×2/5÷3/5×2/5
=6/25÷3/5×2/5
=2/5×2/5
=4/25
300-2520÷24
=300-105
=195
3.6÷(7.2-4×1.5)
=3.6÷(7.2-6)
=3.6÷1.2
=3
31÷(1/3+2/5)÷9/11
=31÷(11/15)÷9/11
=31÷(11/15×9/11)
=31÷(3/5)
=155/3
请给满意答案